I think the only realistic ways (from the point of view of my work load) to make the ponygirl content available in the general gameplay would be to either change or offer an alternative start to the path (making it not dependent on getting enslaved, and instead becoming indebted with Lady Pendleton and accepting to become a ponygirl as an alternative way to repay her) or have an entirely different character with more ponygirl content.
Both of these would still be a considerable amount of work, but wouldn't mess up the game's structure significantly (especially the first one). Still, it's not the kind of effort I can simply add to my "to-do" list, there is enough unfinished content as it is.
Maybe when the game is finished, I can ask people if they are still interested in more, and let them vote on what stuff they want me to expand/revisit, but as for the short-medium term, I wouldn't do any more work on the path, given the situation.
yeah i understand and im not really expecting it to come into fruition and at this point its just fan-fic
i don't think starting a new start would be necessary you would just need a good backstory to give Pendleton a reason to let Erica continue the main storyline
there are 2 back story i could think of on the fly
Pendleton could have a close friend or family member that revealed to her that he/she was a shapeshifter but for some reason perished or disappeared leaving Pendleton sad and a tad curious (this is the weakest one)
or
Pendleton could have met a foreign dignitary who is a shapeshifter and after a long trist both fell in love then she (the foreign dignitary) revealed to pendleton that she was a shapeshifter and both wanted to have a life together (or get married) and after a while Pendleton became pregnant with the dignitarys child (the dignitary is a shapeshifter and might know of a way to shapeshift into a Futa as those exists in this universe) but after a while the dignitary was assassinated by a demon hunting group that specifically hunts shapeshifters, worried about her child pendleton hid her away (i believe this is the strongest one to give pendleton a good reason to allow erica to continue her quest for knowledge on the shapeshifters) with this after Pendleton finds out that erica is also a shapeshifter tasks her into finding a way to hide or seal away Pendletons daughters shapeshifter abilities and as knowledge of shapeshifters is already scarce and if i recall none shapeshifters cant enter shapeshifter temples Pendletons only choice to safeguard her child is Erica
and the way to make it a tad realistic (story-wise) to allow erica to just run around free even though she is a slave is to have a magical (magic it solves every narrative story) contract that binds Erica to Pendletons, it then be showed as a tattoo like the Zanti one and or a magical accessory like the one used in the merchant slave route
this way it wouldn't really vary much from the existing story-line but would just cut out certain routes like the noble route, for ericas handler it can be made to replace the slaves you can own in game like if you choose the butler he would act like the male slave who would be dominant and train erica for teh ponygirl races, if you choose the maid it would be similar to the female slave who would be a more loving relationship and would specialize in training Erica for shows
as Pendleton is a noble (i don't really know how high her status is but from what i gather from the Noblese oblige quest she is very influential) Erica would be acting as Pendletons servant who carries her will this would alleviate the whole slavery thing a tad but it would also be a good side thing where plebs would sexual harass Erica as she continues her story